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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | $ 6 |  | $ 7 |
Liabilities, Fair Value | 0 |  | (1) |
PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value |  |  | 0 |
Liabilities, Fair Value |  |  | (5) |
PSEG [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 6 |  | 7 |
Liabilities, Fair Value | 0 |  | (6) |
Various [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 1 |  | 0 | [1]
Liabilities, Fair Value | 0 |  | 0 | [1]
Electric Load Contracts [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 5 |  | 7 |
Liabilities, Fair Value | $ 0 |  | (1) |
Valuation Technique (s) | Discounted Cash flow | Discounted Cash Flow |  |
Significant Unobservable Inputs | Historic Load Variability | Historic Load Variability |  |
Electric Load Contracts [Member] | Minimum [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Historic Load Variability | 10.00% | 10.00% |  |
Electric Load Contracts [Member] | Maximum [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Historic Load Variability | 0.00% | 0.00% |  |
Natural Gas Supply Contracts [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value |  |  | 0 |
Liabilities, Fair Value |  |  | $ (5) |
Valuation Technique (s) |  | Discounted Cash Flow |  |
Significant Unobservable Inputs |  | Transportation Costs |  |
Natural Gas Supply Contracts [Member] | Minimum [Member] | MWh [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transportation Costs |  | 0.60 |  |
Natural Gas Supply Contracts [Member] | Maximum [Member] | MWh [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transportation Costs |  | 0.80 |  |
[1] | (A)Includes gas positions which were immaterial as of June 30, 2017 and December 31, 2016.

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